key in a box bypass

it should work if it fits right around the key cylinder. Make sure you had your wires connected properly. I dont suggest you cut into the tx and rx wires because its not a DATA bypass not requiring the key. Its basically sending a signal to the rf ring. there is only two wires, when yu remote start see if the box clicks. if so then its working properly.

No, the tx/rx carry data signals from the transceiver ring to a module somewhere else in the car. Since your bypass module puts out just an RF signal from the key it can't be wired directly into them.

On any car with transponder keys, the RF signal from the key has to be converted to some other kind of signal in order to enable fuel/spark/cranking.  On European cars(BMW and VW I know for sure are like this, I really haven't done others), that signal is converted somewhere away from the key cylinder, and the wires to the antenna ring can be tapped into with a key-in-box type bypass.

On most American and Asian cars, they RF signal is converted to data right at the antenna ring (this is why it has ignition and ground going to it). 

Also, I've found on Fords that a data bypass is far superior - the cars are really sensitive to how the ring from an RF bypass is mounted and tend to not see the key when it's cold.

I'm in Kitchener.  The only reason I ask is because the company I work for only wants to bring in the key style bypasses.  I think I will try to get them to get the data bypass style if they're cheap enough.  I looked at iDatalink's ADS TBSL FM for Ford vehicles, but it's special order for me.  I'll see what I can do to get them to bring them in.